Hammer for physical exercises

ABSTRACT

A hammer for physical exercise is disclosed to include a ball, which has two inflatable inner tubes surrounded by a spherical outer shell and a rigid center tube fixedly fastened to the spherical outer shell, and an operating cord member fixedly fastened to the center tube of the ball for operation with the hands to swing the ball so as to exercise the muscles of the hands and the waist.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates a hammer for physical exercises and more particularly to such a hammer that is practical for exercising the muscles of the hands and the waist and practicing the skill of keeping the body in balance.

2. Description of the Related Art

A conventional hammer for physical exercises comprises a ball, a handle, and a connecting wire connected between the ball and the handle. The ball is stuffed with metal weights, ferrous sands, water or any of a variety of heavy substances to increase the weight. This ball does not rebound when hit a wall. Further, the center of the gravity of the ball may be not at the true center of the ball. It is dangerous to play with a hammer of this design.

SUMMARY OF THE INVENTION

The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a hammer, which is practical for exercising the muscles of the hands and the waist. It is another object of the present invention to provide a hammer, which is practical and safe in use for exercising the skill of keeping the body in balance. To achieve these and other objects of the present invention, the hammer comprises ball, which comprises a spherical outer shell, two inflatable inner tubes mounted inside the spherical outer shell, and a rigid center tube fixedly fastened to the spherical outer shell, and an operating cord member fixedly fastened to the center tube of the ball for operation with the hands to swing the ball or to hit the ball against a wall.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view of a ball for hammer according to the present invention.

FIG. 2 illustrates a cord member fastened to the ball according to the present invention.

FIG. 3 is an elevational view of a hammer according to the present invention.

FIG. 4 is a schematic drawing showing an example of use of the hammer according to the present invention.

FIG. 5 is a schematic drawing showing another example of use of the hammer according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 1 and 2, a ball 10 for hammer in accordance with the present invention is shown comprising a spherical outer shell 13, two inflatable inner tubes 11 and 11′ mounted inside the spherical outer shell 13, a rigid center tube 14 fixedly fastened to the spherical outer shell 13 at the center, and an air valve 12 extending from one inner tube 11′ to the periphery of the spherical outer shell 13. Through the air valve 12, an inner tube 11′ is inflatable with forced air. According to this embodiment, the center tube 14 is a ferrous tube formed integral with the spherical outer shell 13 upon vulcanization of the spherical outer shell 13.

The spherical outer shell 13 has a predetermined thickness and weight so that the ball 10 can be made in, for example, 2 KG, 4 KG, or 10 KG.

An operating cord member 20 is inserted through the center tube 14 of the ball 10, and made to have a first knot 21 stopped at one end of the center tube 14 and a second knot 21′ stopped at the other end of the center tube 14. After connection of the operating cord member 20 to the center tube 14, the ball 10 forms with the operating cord member 20 the designed hammer.

When in use, the user can hold one end of the operating cord member 20 to swing the ball 10 over the head (see FIG. 4), or to hit the ball 10 against the wall (see FIG. 5), thereby exercising the muscles of the hands and the waist, and training the skill to keep the body in balance.

Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. 

1. A hammer comprising: a ball, said ball comprising a spherical outer shell, two inflatable inner tubes mounted inside said spherical outer shell, and a rigid center tube fixedly fastened to said spherical outer shell; and an operating cord member inserted through said rigid center tube, said operating cord member having a first knot stopped at one end of said rigid center tube and a second knot stopped outside an opposite end of said rigid center tube.
 2. The hammer as claimed in claim 1, wherein one of said inflatable inner tubes has an air valve extended to the periphery of said spherical outer shell.
 3. The hammer as claimed in claim 1, wherein said rigid center tube is a ferrous tube. 